Blitz endgame

This endgame was played in a 3' game, and even though I eventually won, I think that there are some improvements in my opponent's defense. I've been looking at the game, but I can't find any correct plan for white to get a win (or even save the draw).

Also, if there's any mistake in the annotations , please let me know. I'm very weak playing endgames (I've actually lost some winning games due to my lack of endgame knowledge).

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